TownOfSalem is a ramped up version of the Mafia game, to avoid most of the players just sitting around during night phases. In the normal Mafia, there are just Mafia, Civvies, Doctor, and sometimes a Vigilante or Inspector (Inspector works as ToS Sheriff in normal Mafia). No Mediums (though that would be interesting if it were able to be moderated), Executors or Jesters.
Some would argue that it's more boring that way, but at the same time, there is a lot more time for deliberation and being sure of your choices to lynch or not to lynch someone. ToS is notorious for forcing players to bad decisions because they feel pressured by the 45 second clock. I am guilty of this as well.